2. A medium size power station is used to produce 30 MW net power for a refinery. The station uses steam as the operating fluid and operates according to the Carnot cycle between the pressure limits of 0.4 bar and 35 bar. Steam enters the boiler as a saturated liquid and leaves it as a dry saturated vapour. (i) List the name of the four processes in a generic Carnot cycle and state what type of energy transfer (work/heat) can be neglected in each process. (ii) Sketch a T-s diagram for the above cycle indicating the location of the four components required. (iii) Determine the dryness fraction of the steam that is fed to the condenser. (iv) Determine the specific enthalpy values at the four key points of the cycle. (v) Calculate the specific heat provided to the boiler, the specific work extracted from the power station and the mass flow rate of the steam circulating in the cycle (vi) Determine the thermal efficiency of the cycle. (vii) Using the highest and lowest temperature values in the cycle, re- calculate the efficiency of the cycle and show that it is equivalent to the result in part (vi). (viii) Calculate the thermal efficiency of the power station if the isentropic efficiency of the steam turbine is 94%.
2. A medium size power station is used to produce 30 MW net power for a refinery. The station uses steam as the operating fluid and operates according to the Carnot cycle between the pressure limits of 0.4 bar and 35 bar. Steam enters the boiler as a saturated liquid and leaves it as a dry saturated vapour. (i) List the name of the four processes in a generic Carnot cycle and state what type of energy transfer (work/heat) can be neglected in each process. (ii) Sketch a T-s diagram for the above cycle indicating the location of the four components required. (iii) Determine the dryness fraction of the steam that is fed to the condenser. (iv) Determine the specific enthalpy values at the four key points of the cycle. (v) Calculate the specific heat provided to the boiler, the specific work extracted from the power station and the mass flow rate of the steam circulating in the cycle (vi) Determine the thermal efficiency of the cycle. (vii) Using the highest and lowest temperature values in the cycle, re- calculate the efficiency of the cycle and show that it is equivalent to the result in part (vi). (viii) Calculate the thermal efficiency of the power station if the isentropic efficiency of the steam turbine is 94%.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Could subsection Vii and onwards be solved please?
Transcribed Image Text:A medium size power station is used to produce 30 MW net power for a
refinery. The station uses steam as the operating fluid and operates
according to the Carnot cycle between the pressure limits of 0.4 bar and
35 bar. Steam enters the boiler as a saturated liquid and leaves it as a
dry saturated vapour.
2.
(i)
List the name of the four processes in a generic Carnot cycle and
state what type of energy transfer (work/heat) can be neglected
in each process.
(ii) Sketch a T-s diagram for the above cycle indicating the location of
the four components required.
(iii) Determine the dryness fraction of the steam that is fed to the
condenser.
(iv) Determine the specific enthalpy values at the four key points of
the cycle.
(v)
Calculate the specific heat provided to the boiler, the specific
work extracted from the power station and the mass flow rate of
the steam circulating in the cycle
(vi) Determine the thermal efficiency of the cycle.
(vii) Using the highest and lowest temperature values in the cycle, re-
calculate the efficiency of the cycle and show that it is equivalent
to the result in part (vi).
(viii) Calculate the thermal efficiency of the power station if the
isentropic efficiency of the steam turbine is 94%.
Transcribed Image Text:(ix)
State main disadvantages of using the Carnot cycle as the basis for
a power station.
(x)
State the name of the cycle that is used in practice in power
stations, along with three key benefits over the Carnot cycle.
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